As honorary director of the Cenozoic Research Laboratory he also studied fossils of the Peking Man, then known as Sinanthropus pekinensis, unearthed at Zhoukoudian, China. Weidenreich originated the "Weidenreich Theory of Human Evolution" based on his examination of Peking Man. Being an anatomist, Weidenreich observed numerous anatomical characteristics that Peking Man had in common with modern Chinese, this led to his Polycentric evolution model of human origins.[3]